Casing head for oil wells



May 26, 1925.

M. S. BLACK CASING HEAD FOR OIL WELLS Filed July 19*r 1924 gslnmm 26IHHHIHIHIIIII the seat 6 around the oil Patented May 26, 1925.

UNlTED STATES MILLABD S. BLACK, OF HUNTINGTON PARK, CALIFORNIA.

CASING HEAD FOR :OIL WELLS.

Application l'ed July 19, 1924. Serial No. 727,000.

To aZZ whom t may concern:

Be it known that I, MJLLAnn SUMTER BLACK, a citizen of the UnitedStates, residing at Huntington Park, in the county of Los Angeles andState of California, have invented new and useful Improvements in CasingHeads for Oil Wells, of which the following is a specification.

An object is to make a casing head for oil wells so that when the timecomes `for setting an oil string and holding the gas the packing andcompression means may be quickly applied.

Another object is to make a casing head having a packing compressionring made in two pieces so that the ring may be quickly inserted throughthe spider.

Other objects and advantages will appear from the drawings andspecication.

The drawings illustrate a casing head embodying the principles of myinvention.

Figure 1 is a top plan :view of the casing head, the view beingtakenlooking in the direction indicated by the arrow 1 in Fig. 2.

Fig. 2 is a vertical diametrical sectional detail on the line 2-2 ofFig. 1 and looking in the direction indicated by the arrows and showingthe casing head packed and ready to hold the gas ressure in the well.

Fig. 3 is a view ana ogous to Fig. 2 and showing a step in the operationof applying the packing, and showing a modified form of compressionmember.

Fig. 4 is a plan of the two-piece compressing ring shown in Figs. 2 and3.

Fig. 5 is an edge view looking in the direction indicated by the arrow 5in Fig. 4.

Fig. 6 is an inside view in elevation of one piece of the ring shown inFi 4, the view being taken looking in the 'rection indicated by thearrow 6.

The details of construction and operation shown in the drawings are asfollows:

The oil well casing 1 has a coupling 2 screwed upon its upper end andthe casing head extension 3 is screwed into the coupling 2. The casinghead extension 3 `has outlet pipes 4 and 5. A packing ring supportingseat 6 is formed above the pipes 4 and 5, a two-piece packing ring 7fits upon pipe string 8, packing sections 9 fit upon the packing ring 7,and a two-piece metal gland 10 fits against the packing 9. A compressionmember ring or sleeve 1l is screwed upon the upper end of the extension3 and has an enlarged bore 12 extending from its lower end to acompression shoulder 13 and a smaller bore 14 inside of the shoulder 13.This compression member serves primarily for compressing or holdinfr thepacking as shown in Fig. 3, and secon arily it may serve as a base uponwhich a spider 11a ma be formed integrally as shown in Fig. 2. hen thespider is used the spider bore 15 leads to the bore 14 and is flaredoutwardly to form a seat for the slips 16.

,The bore 14 is larger than the parts 7, 9 and 10 so that these partsmay be inserted downwardly through the bore 14.

The two-piece compression ring 17 has an opening 18 considerably largerthan the oil pipe 8. The compressing ring 17 is L- shaped in crosssection and has a vertical inner wall 2O surrounding the opening .19 andsmaller than the opening 14 and has a horizontal flange 21 extendingoutwardly from the bottom of the wall 20 and adapted to lit the shoulder13. The ring 17 is parted on the diametrical lines 22 and 23, thusroducing the portions 24 and 25. The ends of the flanges 21 of theportions 24 and 25 are cut away on straight lines 26 and 27 to makeclearance for the insertion of the pieces into the casing head.

After the oil pipe string 8 has been inserted and it is desired to setthe string to hold the gas, the parts 7 9 and 10 are quickly inserteddownwardly through the bore 14 and the oil pipe string 8 may be lowereduntil the o-il pipe coupling 28 engages the gland 10 and presses thepacking firmly in place. Then the two-piece compression ring 17 isiinserted one piece at a time. Take the piece 25, for instance, andplace the inner face 29 against the coupling 28 with the piece held atan incline with the ends upwardly and pass the iece down between thecoupling 28 and the ace of the bore 14 until the flange 21 hooks underthe shoulder 13, and then press the ends of the piece clownwardly untilthe fiange 21 is Vwell seated under the shoulder 13. Then the otherpiece 24 may be inserted in the same way. After the ring 17 has beeninserted, the flange 21 engages the shoulder 13 and the lower face ofthe ring overlaps the gland 10 so that the compression member 11 holdsthe packing in place and so that the packing may be tightcned byscrewing the compression member 11 down upon the extension 3.

Another way that the ring 17 may be applied is to ,lower the oil pipestring 8 until the coupling 28 presses the packing firmly into place;then momentarily raise the oil string to raise the coupling 28 highenough to be out of the way while the pieces 24 and 25 are inserted.

Thus I have produced a casing head for oil wells which may be quicklypacked when the time approaches for the well to blow in, the casing headcomprising a casing extension having a packing seat, a compressionmember screwed `upon the extension and having an opening large enoughfor the in` sertion of the packing through the spider, and a Ytwo piececompression ring insertable through thecompression member to hold thepacking. i

Various changes may be made without departing from the spirit of theinvention as claimed.

I claim:

1. A casing head comprising a casing eX- tension having a packing seat,a compression member screwed upon the extension and having a bore largeenough for the insertion of packing through the bore into the packingseat and having a compression ring seat, and a two-piece compressionring insertable through the bore into the ring seat to overlap theplace.

2. A casing head comprising a casing extension having a packing seat, acompression member screwed upon the extension and having a bore largeenough for the insertion of packing through the bore into the packingseat and having a compression ring seat, a packing supportin ringinserted through the bore into the pac ring seat, a packing insertedthrough the bore into the packing seat against the supporting ring, agland inserted packing and hold the packing in' through the bore intothe packing seat against the packing, and a two-piece compression ringinserted through the bore into the ring seat and against the gland tohold the packing in place.

3. A casing head comprising a casing eX- tension having a packing seat,a compression member screwed upon the extension and having a bore largeenough for theinsertion of packing through the bore into the packingseat and having a compression ring seat and so that an oil pipe may passthrough the casing head, packing in the packing seat, a gland at the topof the packing so that the packing may be compressed by lowering the oilpipe until a coupling engages the gland, and a two-piece compressionring insertable through the bore around the oil pipe into the ring seatand to engage the gland to hold the packing in place.

4. A casing head comprising a casing eX- tension having a packing seat,a compression member screwed upon the extension and havinga bore largeenough for the insertion of packing through the bore into the packingseat and having a compression ring seat, a spider formed integrally withand extending upwardly from the compression member and adapted toreceive slips, a packing supporting ring inserted through the bore intothe packing seat, a packing inserted throughthe bore into the packingseat against the supporting ring, a gland inserted through the bore intothe packing seat against the packing, and a two-piece compression ringinsel-ted` through the bore into the ring seat and against the gland tohold the packing in place. Y

In testimony whereof I have signed my name to this specification.

M. S. BLACK-

